Speedometer



Filed Jan, 3 1929 5 Sheets-Sheet 1 @MHMEJ Oct. 20, 1931. P KOURTZMAN1,827,988

SPEEDOMETER Filed Jan. 31, 1929 5 Sheets-Sheet 2 Oct. 20, 1931. P. A.KOURTZMAN 1,827,933

SPEEDOMETER Filed Jan. 51, 1929 5 Sheets-Sheet 5 Oct. 20, 1931. P. A.KOURTZQMAN 1,827,938

SPEEDOMETER Filed Jan. 31, 1929 5 Sheets-Sheet 4 06L 1931- P. A.KOURTZMAN ,8 ,98

SPEEDOMETER Filed Jan. 31, 1929 5 Sheets-Sheet 6 HTro ems m" PatentedOct. 20, 1931 PATENT OFFICE PER ANDERSSON KOURTZMAN, OF VARTAN, SWEDENSPEEDOMETER Application filed January 31, 1929, Serial No. 336,364, andin Sweden February 8, 1928.

. locking device for automatically locking the apparatus. on its beingdisconnected or disengaged from its driving device or mechanism on thevehicle. The aforesaid parts of the apparatus are meant to cooperate forthe purpose of producing a complete apparatus,

by means of which a particularly efiicient check can be exercised. Thecharacteristics of the invention consist of the special arrai'igementsof the said parts, which will be quite obvious from the claims, whichare illustrated by the following description of one form of constructionof the apparatus with reference to the accompanying drawings.

On these drawings Fig. 1 shows the apparatus in elevation, Fig. 2 showsthe apparatus in vertical section. Fig. 3 shows in elevation the rotarycylinder with the speed diagram, the adjustment device for the same, thecounting mechanism and the penalty sign. Fig. 4 shows in elevation theclock- 35 work. Fig. 5 shows the diagram adjustment device, the penaltysign, the clockwork and the counting mechanism seen from above. Fi 6shows a horizontal section of the appa ratus through the rotarycylinder, Fig 7 shows a horizontal section of the apparatus through thelower portion of the same. Figs. 8 and 8a are respectively a sectionalside view and an edge view of a spring drum forming a part of theapparatus; Fig. 9 is a longitudinal sectional view illustrating adetail; and Figs. 10 and 11 are respectively a side view and an edgeview illustrating still another detail of the apparatus.

In the example shown. the rotary-diagram cylinder consists of a verticalouter casing 1 provided in its periphery with vertical grooves 3 (Fig.6) and an inner metal drum 2 provided at its lower end with a flange 2on which the casing 1 rests. At the bottom of the casing 2 there isinteriorly fixed a ring 4, by means of which the diagram cylinder issupported on rollers 5, which are journalled in a stationary disc 6,supporting bearings 7 for rollers 8, which rest against the inner cornerof the ring 4. The diagram cylinder rotates on the rollers 5 and isduring this process steered by the rollers 8 and its rotary motion' istransmitted from the running wheels of the vehicle by means of aflexible shaft, which is connected up to a vertical 65 shaft 9journalled in the bottom of the apparatus. This shaft imparts to thediagram cylinder a rotation proportional to the distance covered by thevehicle through the agency of a train of gears 10, 10, 10", 10, 10,

'10" and 10 and a cogged ring 11 inside the diagram cylinder. Around theouter grooved surface of the diagram cylinder is laid an endless cord orchain 12, forming the diagram, and this cord or chain 12 is kept inposition with a suitable pressure between the grooved surface of thediagram cylinder and a transparent fixed wall 13. e. g. of glass,whichsurrounds a portion of the diagram cylinders circumference. As thelength of S that portion of the cord 12 which is visible through theglass wall 13 must vary according to its position on the diagramcylinder, there must be a device or arrangement which permits of thisvariation. By way of example, a device for accomplishing this isindicated diagrammatically at 14 in Fig. 6 and structurally in Figs. 10and 11. This device may consist of a pair of guide rollers 71 mountedfor rotation in fixed bearings 72 carried by'a Vertical frame 14, theside members of which are provided with elongated slots 73 in which areguided trunnion bearings extending from a roller 74 around which thecord 12 is looped in its passage from one roller 71 to the other. Theroller 74 thus serves to take up the slack of the cord and give up saidslack under the pull exerted on the cord by the upward movement of theband15 hereinafter described. Y

The adjustment device for the cord will now be described. r t one of thevertical edges of the glass wall 13 there is a band or achain 15 movablein a vertical direction close to the diagram cylinder. To this band 15is fastened a piece of tube 16, which carries along the cord 12 in thevertical motion of the band but permits it to run freely through thesame. hen the apparatus is in operation the piece of tube 16 moves withthe band 15 up or down according to the various speeds of the vehicle,and carries along with it the cord 12 participating in the rotation ofthe diagram cylinder, the loop of the cord at 14 being shortened orlengthened. In this process the cord 12 will show a speed diagram of, byway of example, the form visible in Fig. 1, and the diagram cylinder isassumed to rotate from left to right. The band 15 lies with its upperend on a running wheel 17 journalled to fixed bearings, and is attachedto this wheel 17. The rumiing wheel 17 is attached to a conple ofpulleys or sprocket wheels 18, to which are attached, cables 19, whichrun over rollers 20 journalled in fixed bearings, and over other rollers21, and are made fast to a stationary bracket 22. The rollers 21 arejournalled in a sleeve 23, which is slidable on an upper shaft 24journalled in the apparatus and concentric with the shaft 9, but doesnot participate in its rotation. Another sleeve 25 on shaft 24 isslidable on the same together with the sleeve 23 but does participate inthe rotation of shaft 24. The sleeve 25 forms part of a centrifugaldevice, which has several toggle links 27 equipped with weights 26, andthese links 27 connect the sleeve 25 with a lower sleeve 28 attached tothe shaft 24, the sleeve 28 being journalled by means of ball hearingsto the fixed disc 6. The sleeves 23 and 25 are also journalled by ballbearings. A spiral spring 29 is located on the shaft 24 between thesleeves 25 and 28. The band 15 is secured at its lower end to a drum 30,and is attached to the latter. This latter is secured on a shaft 32which is journalled in a bracket 31. The outer end of a flat spiralspring 33 is attached to the inner circumference of the drum, the innerend of this spiral spring 33 being attached to a roller 34 looselylocated on the shaft, and the roller 34 by means of a nut 35 can betightened against the bracket under different conditions of ten sion forthe spring in relation to the centrifugal force. The shaft 24 ispropelled by the shaft 9 with the agency of gears 36.

One of the arms of a double-armed lever 37, 39 journalled to a pin 38supports the penalty sign 40. A projection 41 on the run ning wheel 17(Fig. 5), on exceeding the speed limit, forces the other arm 39 of thislever downwards, so that the arm 37 is raised and the penalty signbecomes visible. In

this connection a tooth 42 on the arm 37 engages a thick screw 43 (Figs.3 and 9), which is attached to a rotary shaft 44 to which is attached acog wheel 45, attached to one of the figure wheels marking the shortestdistances in the counting mechanism 46. During the rotation of the shaft44 the lever 37, 39 is in this process on account of the tooths 42engaging the screw 43 shifted on its pivot 38 against the action of aspring 47 towards the right in Fig. 5, making the penalty sign visibleas long as the speed limit is being exceeded. If the maximum speed lastsbeyond a certain distance, the tooth 42 is moved across to a narrowerscrew 48 on a rotary shaft 49 (Fig. 9), on which is located a cog wheel50, which is attached to one of the figure wheels marking the longestdistance in the counting mechanism 46, after which the penalty sign iskept in a visible position for a certain distance, inasmuch as the toothis maintained in engagement with the screw 48 by reason of the fact thatthe arm 37 is sup ported on a friction surface disposed below and of thesame length as said screw. The said friction surface is fully describedin my copen ding application Serial No. 440,829, and since it is not ofthe essence of the invention herein, it has been omitted from thedrawings for the sake of clarity. As soon as the arm 37 has passedbeyond the said supporting surface, the arm will drop by gravity, thuscarrying the penalty sign out of view, whereupon the arm 37, under theaction of spring 47, is returned to its initial position. Owing to thefact that the arm 39 is articulated and is actuated by a spring 51 theouter end of it can give way in the case of excessive speed, and obviatedamage to the mechanism. An ordinary jaw-clutch 52 (onlyindicated inFig. 2) enables the apparatus to stand still on backing.

The clockwork will now be described. On the underside of a cogwhcel 53,journalled to the upper part of the apparatus, and oper-- ated by theshaft 24 by means of a gear 54, there are in radial guides located twodiametrically opposed weights 55, which by centrifugal force are pressedoutwards against the action of springs 56. One of: these weights isprovided with a pin 57, which at every revolution of the cogwheel 53strikes against a clapper 58 actuated by a spring 59, when a certainspeed has been exceeded by the vehicle, and makes the clapper strikeagainst a. bell and thus sound the alarm.

The counting mechanism is operated by the diagram cylinder through theagency of a. eogged ring 60 inside the upper part of the same, acogwheel61, two cooperating bevelled wheels 62. and a cogwheel 63 cooperatingwith the cogwheel 45 (Figs. 5 and 9).

The locking device for automatically locking the apparatus ondisconnecting it from its driving device on the vehicle consists of abolt 64 slidable in the apparatus and which, when the apparatus isdisconnected, fits into agroove 65 on the shaft 9, and which has a. part66 reaching outside the apparatus,

which on the aforesaid flexible shafts being connected with the shaft 9is by the same moved out of the way with the entire bolt against theaction of a spring 67, so that the bolt leaves the groove 65 andreleases the shaft 9. I

The apparatus is journalled on a base plate 68, which can be fixed tosome suitable place, and has a pin-shaped part 69 projecting through theplate 68, and also a nut 70 screwed upon part 69 under the base plate,so that the apparatus can be turned into any suitable position and thenlocked by means of the nut 70 in this position.

An opening 71 in Fig. 1 serves for making the penalty sign visible.

The separate parts of the apparatus shown may of course be varied inmany ways, provided only the characteristics of the invention areretained. The apparatus can be used on many different kinds of vehicles,e. g. motor cars, locomotives etc.

What I claim is:

1. A speedometer for vehicles, comprising a diagram cylinder mounted forrotation proportionately to the distance covered by the vehicle, aflexible member encircling said cylinder, a fixed transparent walldisposed adjacent to the cylinder, said cylinder being provided on itsperiphery with means for engaging said flexible member and retaining itbetween the cylinder and said wall, a band member traversing saidcylinder in a direction at right angles to the direction of rotation ofthe cylinder, means carried by said band member in loose engagement withsaid flexible member, centrifugal means rotatable with the cylinder formoving said band member in one direction proportionately to the rotarymovement of the cylinder, and means automatically operative to move theband member in the opposite direction.

2. A speedometer for vehicles, comprising a diagram cylinder mounted forrotation proportionately to the distance covered by the vehicle, aflexible member encircling said cyl inder, a fixed transparent walldisposed adjacent to the cylinder, said cylinder being provided on itsperiphery with means for engaging said flexible member and retaining itbetween the cylinder and said wall, a band member traversing saidcylinder in a direction at right angles to the direction of rotation ofthe cylinder, means carried by said band member in loose engagement withsaid flexible member, centrifugal means rotatable with the cylinder formoving said band member in one direction proportionately to the rotarymovement of the cylinder, and a spring-actuated drum in engagement withthe band member for moving it in the opposite direction.

3. A speedometer for vehicles, comprising a diagram cylinder mounted forrotation proportionately to the distance covered by the vehicle, aflexible member encircling said cylinder, a fixed transparent walldisposed adjacent to the cylinder, said cylinder being provided on itsperiphery with means for engaging said flexible member and retainin itbetween the cylinder and said wall, a band member traversing saidcylinder in a direction at right angles to the direction of rotation ofthe cylinder, means carried by said band member in loose engagement withsaid flexible member, centrifugal means rotatable with the cylinder formoving said band member in one direction, and a spring-actuated drum inengagement with the band member thereby to place its spring undertension during movement of the band member under the action of saidcentrifugal means, said spring-drum being effective to move the bandmember in the opposite direction.

In testimony whereof I have signed my name to this specification.

PER ANDERSSON KOURTZMAN.

